20913147 has 30 divisors (see below), whose sum is σ = 32460428. Its totient is φ = 13417488.

The previous prime is 20913133. The next prime is 20913149. The reversal of 20913147 is 74131902.

It is not a de Polignac number, because 20913147 - 2⁶ = 20913083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20913147.

It is not an unprimeable number, because it can be changed into a prime (20913149) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 67968 + ... + 68274.

Almost surely, 2^20913147 is an apocalyptic number.

20913147 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20913147 is a deficient number, since it is larger than the sum of its proper divisors (11547281).

20913147 is an equidigital number, since it uses as much as digits as its factorization.

20913147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 20913147 is about 4573.0894371311. The cubic root of 20913147 is about 275.5115415294.

The spelling of 20913147 in words is "twenty million, nine hundred thirteen thousand, one hundred forty-seven".